/*
 * Copyright 2016 Red Hat, Inc. and/or its affiliates.
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *       http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */

package org.kie.workbench.common.services.refactoring.backend.server.indexing;

import org.apache.lucene.analysis.Analyzer;
import org.apache.lucene.analysis.TokenStream;
import org.apache.lucene.analysis.core.LowerCaseFilter;
import org.uberfire.ext.metadata.backend.lucene.analyzer.LowerCaseTokenizer;

/**
 * A specialise analyzer to include special characters in attribute names, such as "-"
 */
public class LowerCaseOnlyAnalyzer extends Analyzer {

    public LowerCaseOnlyAnalyzer() {
        super();
    }

    @Override
    protected TokenStreamComponents createComponents( final String fieldName ) {
        final LowerCaseTokenizer src = new LowerCaseTokenizer();
        final TokenStream tok = new LowerCaseFilter( src );

        return new TokenStreamComponents( src, tok );
    }
}
